summaryrefslogtreecommitdiffstats
path: root/sys/nfsserver/nfs_syscalls.c
blob: f81900bea29b0866c6262f4390a96e4bbc5e69ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
/*-
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs_syscalls.c	8.5 (Berkeley) 3/30/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_inet6.h"
#include "opt_mac.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#ifdef INET6
#include <net/if.h>
#include <netinet6/in6_var.h>
#endif
#include <nfs/xdr_subs.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsserver/nfs.h>
#include <nfsserver/nfsm_subs.h>
#include <nfsserver/nfsrvcache.h>

#include <security/mac/mac_framework.h>

static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");

MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");

#define	TRUE	1
#define	FALSE	0

SYSCTL_DECL(_vfs_nfsrv);

int		nfsd_waiting = 0;
int		nfsrv_numnfsd = 0;
static int	notstarted = 1;

static int	nfs_privport = 0;
SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
	    &nfs_privport, 0, "");
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
	    &nfsrvw_procrastinate, 0, "");
SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
	    &nfsrvw_procrastinate_v3, 0, "");

static int	nfssvc_addsock(struct file *, struct sockaddr *,
		    struct thread *);
static void	nfsrv_zapsock(struct nfssvc_sock *slp);
static int	nfssvc_nfsd(struct thread *);

/*
 * NFS server system calls
 */

/*
 * Nfs server psuedo system call for the nfsd's
 * Based on the flag value it either:
 * - adds a socket to the selection list
 * - remains in the kernel as an nfsd
 * - remains in the kernel as an nfsiod
 * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
 * and that mountd provides
 *  - sockaddr with no IPv4-mapped addresses
 *  - mask for both INET and INET6 families if there is IPv4-mapped overlap
 */
#ifndef _SYS_SYSPROTO_H_
struct nfssvc_args {
	int flag;
	caddr_t argp;
};
#endif
int
nfssvc(struct thread *td, struct nfssvc_args *uap)
{
	struct file *fp;
	struct sockaddr *nam;
	struct nfsd_args nfsdarg;
	int error;

	KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));

#ifdef MAC
	error = mac_check_system_nfsd(td->td_ucred);
	if (error)
		return (error);
#endif
	error = priv_check(td, PRIV_NFSD);
	if (error)
		return (error);
	NET_LOCK_GIANT();
	NFSD_LOCK();
	while (nfssvc_sockhead_flag & SLP_INIT) {
		 nfssvc_sockhead_flag |= SLP_WANTINIT;
		(void) msleep(&nfssvc_sockhead, &nfsd_mtx, PSOCK,
		    "nfsd init", 0);
	}
	NFSD_UNLOCK();
	if (uap->flag & NFSSVC_ADDSOCK) {
		error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
		if (error)
			goto done2;
		if ((error = fget(td, nfsdarg.sock, &fp)) != 0)
			goto done2;
		if (fp->f_type != DTYPE_SOCKET) {
			fdrop(fp, td);
			goto done2;
		}
		/*
		 * Get the client address for connected sockets.
		 */
		if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
			nam = NULL;
		else {
			error = getsockaddr(&nam, nfsdarg.name,
					    nfsdarg.namelen);
			if (error) {
				fdrop(fp, td);
				goto done2;
			}
		}
		error = nfssvc_addsock(fp, nam, td);
		fdrop(fp, td);
	} else if (uap->flag & NFSSVC_NFSD) {
		error = nfssvc_nfsd(td);
	} else {
		error = ENXIO;
	}
	if (error == EINTR || error == ERESTART)
		error = 0;
done2:
	NET_UNLOCK_GIANT();
	return (error);
}

/*
 * Adds a socket to the list for servicing by nfsds.
 */
static int
nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
{
	int siz;
	struct nfssvc_sock *slp;
	struct socket *so;
	int error, s;

	NET_ASSERT_GIANT();

	so = fp->f_data;
#if 0
	/*
	 * XXXRW: If this code is ever enabled, there's a race when running
	 * MPSAFE.
	 */
	tslp = NULL;
	/*
	 * Add it to the list, as required.
	 */
	if (so->so_proto->pr_protocol == IPPROTO_UDP) {
		tslp = nfs_udpsock;
		if (tslp->ns_flag & SLP_VALID) {
			if (mynam != NULL)
				FREE(mynam, M_SONAME);
			return (EPERM);
		}
	}
#endif
	if (so->so_type == SOCK_STREAM)
		siz = NFS_MAXPACKET + sizeof (u_long);
	else
		siz = NFS_MAXPACKET;
	error = soreserve(so, siz, siz);
	if (error) {
		if (mynam != NULL)
			FREE(mynam, M_SONAME);
		return (error);
	}

	/*
	 * Set protocol specific options { for now TCP only } and
	 * reserve some space. For datagram sockets, this can get called
	 * repeatedly for the same socket, but that isn't harmful.
	 */
	if (so->so_type == SOCK_STREAM) {
		struct sockopt sopt;
		int val;

		bzero(&sopt, sizeof sopt);
		sopt.sopt_dir = SOPT_SET;
		sopt.sopt_level = SOL_SOCKET;
		sopt.sopt_name = SO_KEEPALIVE;
		sopt.sopt_val = &val;
		sopt.sopt_valsize = sizeof val;
		val = 1;
		sosetopt(so, &sopt);
	}
	if (so->so_proto->pr_protocol == IPPROTO_TCP) {
		struct sockopt sopt;
		int val;

		bzero(&sopt, sizeof sopt);
		sopt.sopt_dir = SOPT_SET;
		sopt.sopt_level = IPPROTO_TCP;
		sopt.sopt_name = TCP_NODELAY;
		sopt.sopt_val = &val;
		sopt.sopt_valsize = sizeof val;
		val = 1;
		sosetopt(so, &sopt);
	}
	SOCKBUF_LOCK(&so->so_rcv);
	so->so_rcv.sb_flags &= ~SB_NOINTR;
	so->so_rcv.sb_timeo = 0;
	SOCKBUF_UNLOCK(&so->so_rcv);
	SOCKBUF_LOCK(&so->so_snd);
	so->so_snd.sb_flags &= ~SB_NOINTR;
	so->so_snd.sb_timeo = 0;
	SOCKBUF_UNLOCK(&so->so_snd);

	slp = (struct nfssvc_sock *)
		malloc(sizeof (struct nfssvc_sock), M_NFSSVC,
		M_WAITOK | M_ZERO);
	STAILQ_INIT(&slp->ns_rec);
	NFSD_LOCK();
	TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);

	slp->ns_so = so;
	slp->ns_nam = mynam;
	fhold(fp);
	slp->ns_fp = fp;
	/*
	 * XXXRW: Socket locking here?
	 */
	s = splnet();
	so->so_upcallarg = (caddr_t)slp;
	so->so_upcall = nfsrv_rcv;
	SOCKBUF_LOCK(&so->so_rcv);
	so->so_rcv.sb_flags |= SB_UPCALL;
	SOCKBUF_UNLOCK(&so->so_rcv);
	slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
	nfsrv_wakenfsd(slp);
	splx(s);
	NFSD_UNLOCK();
	return (0);
}

/*
 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 * until it is killed by a signal.
 */
static int
nfssvc_nfsd(struct thread *td)
{
	int siz;
	struct nfssvc_sock *slp;
	struct nfsd *nfsd;
	struct nfsrv_descript *nd = NULL;
	struct mbuf *m, *mreq;
	int error = 0, cacherep, s, sotype, writes_todo;
	int procrastinate;
	u_quad_t cur_usec;

	NET_ASSERT_GIANT();

#ifndef nolint
	cacherep = RC_DOIT;
	writes_todo = 0;
#endif
	nfsd = (struct nfsd *)
		malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK | M_ZERO);
	s = splnet();
	NFSD_LOCK();

	nfsd->nfsd_td = td;
	TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
	nfsrv_numnfsd++;

	/*
	 * Loop getting rpc requests until SIGKILL.
	 */
	for (;;) {
		if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
			while (nfsd->nfsd_slp == NULL &&
			    (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
				nfsd->nfsd_flag |= NFSD_WAITING;
				nfsd_waiting++;
				error = msleep(nfsd, &nfsd_mtx,
				    PSOCK | PCATCH, "-", 0);
				nfsd_waiting--;
				if (error)
					goto done;
			}
			if (nfsd->nfsd_slp == NULL &&
			    (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
				TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
				    if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
					== (SLP_VALID | SLP_DOREC)) {
					    slp->ns_flag &= ~SLP_DOREC;
					    slp->ns_sref++;
					    nfsd->nfsd_slp = slp;
					    break;
				    }
				}
				if (slp == NULL)
					nfsd_head_flag &= ~NFSD_CHECKSLP;
			}
			if ((slp = nfsd->nfsd_slp) == NULL)
				continue;
			if (slp->ns_flag & SLP_VALID) {
				if (slp->ns_flag & SLP_DISCONN)
					nfsrv_zapsock(slp);
				else if (slp->ns_flag & SLP_NEEDQ) {
					slp->ns_flag &= ~SLP_NEEDQ;
					(void) nfs_slplock(slp, 1);
					NFSD_UNLOCK();
					nfsrv_rcv(slp->ns_so, (caddr_t)slp,
						M_TRYWAIT);
					NFSD_LOCK();
					nfs_slpunlock(slp);
				}
				error = nfsrv_dorec(slp, nfsd, &nd);
				cur_usec = nfs_curusec();
				if (error && LIST_FIRST(&slp->ns_tq) &&
				    LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
					error = 0;
					cacherep = RC_DOIT;
					writes_todo = 1;
				} else
					writes_todo = 0;
				nfsd->nfsd_flag |= NFSD_REQINPROG;
			}
		} else {
			error = 0;
			slp = nfsd->nfsd_slp;
		}
		if (error || (slp->ns_flag & SLP_VALID) == 0) {
			if (nd) {
				if (nd->nd_cr != NULL)
					crfree(nd->nd_cr);
				free((caddr_t)nd, M_NFSRVDESC);
				nd = NULL;
			}
			nfsd->nfsd_slp = NULL;
			nfsd->nfsd_flag &= ~NFSD_REQINPROG;
			nfsrv_slpderef(slp);
			continue;
		}
		splx(s);
		sotype = slp->ns_so->so_type;
		if (nd) {
		    getmicrotime(&nd->nd_starttime);
		    if (nd->nd_nam2)
			nd->nd_nam = nd->nd_nam2;
		    else
			nd->nd_nam = slp->ns_nam;

		    /*
		     * Check to see if authorization is needed.
		     */
		    cacherep = nfsrv_getcache(nd, &mreq);

		    if (nfs_privport) {
			/* Check if source port is privileged */
			u_short port;
			struct sockaddr *nam = nd->nd_nam;
			struct sockaddr_in *sin;

			sin = (struct sockaddr_in *)nam;
			/*
			 * INET/INET6 - same code:
			 *    sin_port and sin6_port are at same offset
			 */
			port = ntohs(sin->sin_port);
			if (port >= IPPORT_RESERVED &&
			    nd->nd_procnum != NFSPROC_NULL) {
#ifdef INET6
			    char b6[INET6_ADDRSTRLEN];
#if defined(KLD_MODULE)
	/* Do not use ip6_sprintf: the nfs module should work without INET6. */
#define ip6_sprintf(buf, a) \
	 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
		  (a)->s6_addr16[0], (a)->s6_addr16[1], \
		  (a)->s6_addr16[2], (a)->s6_addr16[3], \
		  (a)->s6_addr16[4], (a)->s6_addr16[5], \
		  (a)->s6_addr16[6], (a)->s6_addr16[7]), \
	 (buf))
#endif
#endif
			    nd->nd_procnum = NFSPROC_NOOP;
			    nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
			    cacherep = RC_DOIT;
			    printf("NFS request from unprivileged port (%s:%d)\n",
#ifdef INET6
				sin->sin_family == AF_INET6 ?
				    ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
#if defined(KLD_MODULE)
#undef ip6_sprintf
#endif
#endif
				    inet_ntoa(sin->sin_addr), port);
			}
		    }

		}

		/*
		 * Loop to get all the write rpc relies that have been
		 * gathered together.
		 */
		do {
		    switch (cacherep) {
		    case RC_DOIT:
			if (nd && (nd->nd_flag & ND_NFSV3))
			    procrastinate = nfsrvw_procrastinate_v3;
			else
			    procrastinate = nfsrvw_procrastinate;
			NFSD_UNLOCK();
			if (writes_todo || (!(nd->nd_flag & ND_NFSV3) &&
			    nd->nd_procnum == NFSPROC_WRITE &&
			    procrastinate > 0 && !notstarted))
			    error = nfsrv_writegather(&nd, slp,
				nfsd->nfsd_td, &mreq);
			else
			    error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
				slp, nfsd->nfsd_td, &mreq);
			NFSD_LOCK();
			if (mreq == NULL)
				break;
			if (error != 0 && error != NFSERR_RETVOID) {
				nfsrvstats.srv_errs++;
				nfsrv_updatecache(nd, FALSE, mreq);
				if (nd->nd_nam2)
					FREE(nd->nd_nam2, M_SONAME);
				break;
			}
			nfsrvstats.srvrpccnt[nd->nd_procnum]++;
			nfsrv_updatecache(nd, TRUE, mreq);
			nd->nd_mrep = NULL;
			/* FALLTHROUGH */
		    case RC_REPLY:
			NFSD_UNLOCK();
			siz = m_length(mreq, NULL);
			if (siz <= 0 || siz > NFS_MAXPACKET) {
				printf("mbuf siz=%d\n",siz);
				panic("Bad nfs svc reply");
			}
			m = mreq;
			m->m_pkthdr.len = siz;
			m->m_pkthdr.rcvif = NULL;
			/*
			 * For stream protocols, prepend a Sun RPC
			 * Record Mark.
			 */
			if (sotype == SOCK_STREAM) {
				M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT);
				*mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
			}
			NFSD_LOCK();
			if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
				(void) nfs_slplock(slp, 1);
			if (slp->ns_flag & SLP_VALID) {
			    NFSD_UNLOCK();
			    error = nfsrv_send(slp->ns_so, nd->nd_nam2, m);
			    NFSD_LOCK();
			} else {
			    error = EPIPE;
			    m_freem(m);
			}
			if (nd->nd_nam2)
				FREE(nd->nd_nam2, M_SONAME);
			if (nd->nd_mrep)
				m_freem(nd->nd_mrep);
			if (error == EPIPE)
				nfsrv_zapsock(slp);
			if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
				nfs_slpunlock(slp);
			if (error == EINTR || error == ERESTART) {
				if (nd->nd_cr != NULL)
					crfree(nd->nd_cr);
				free((caddr_t)nd, M_NFSRVDESC);
				nfsrv_slpderef(slp);
				s = splnet();
				goto done;
			}
			break;
		    case RC_DROPIT:
			m_freem(nd->nd_mrep);
			if (nd->nd_nam2)
				FREE(nd->nd_nam2, M_SONAME);
			break;
		    };
		    if (nd) {
			if (nd->nd_cr != NULL)
				crfree(nd->nd_cr);
			FREE((caddr_t)nd, M_NFSRVDESC);
			nd = NULL;
		    }

		    /*
		     * Check to see if there are outstanding writes that
		     * need to be serviced.
		     */
		    cur_usec = nfs_curusec();
		    s = splsoftclock();
		    if (LIST_FIRST(&slp->ns_tq) &&
			LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
			cacherep = RC_DOIT;
			writes_todo = 1;
		    } else
			writes_todo = 0;
		    splx(s);
		} while (writes_todo);
		s = splnet();
		if (nfsrv_dorec(slp, nfsd, &nd)) {
			nfsd->nfsd_flag &= ~NFSD_REQINPROG;
			nfsd->nfsd_slp = NULL;
			nfsrv_slpderef(slp);
		}
		KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
		    ("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
		KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
		    ("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
	}
done:
	KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
	    ("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
	KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
	    ("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
	TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
	splx(s);
	free((caddr_t)nfsd, M_NFSD);
	if (--nfsrv_numnfsd == 0)
		nfsrv_init(TRUE);	/* Reinitialize everything */
	NFSD_UNLOCK();
	return (error);
}

/*
 * Shut down a socket associated with an nfssvc_sock structure.
 * Should be called with the send lock set, if required.
 * The trick here is to increment the sref at the start, so that the nfsds
 * will stop using it and clear ns_flag at the end so that it will not be
 * reassigned during cleanup.
 */
static void
nfsrv_zapsock(struct nfssvc_sock *slp)
{
	struct nfsrv_descript *nwp, *nnwp;
	struct socket *so;
	struct file *fp;
	struct nfsrv_rec *rec;
	int s;

	NET_ASSERT_GIANT();
	NFSD_LOCK_ASSERT();

	/*
	 * XXXRW: By clearing all flags, other threads/etc should ignore
	 * this slp and we can safely release nfsd_mtx so we can clean
	 * up the slp safely.
	 */
	slp->ns_flag &= ~SLP_ALLFLAGS;
	fp = slp->ns_fp;
	if (fp) {
		NFSD_UNLOCK();
		slp->ns_fp = NULL;
		so = slp->ns_so;
		SOCKBUF_LOCK(&so->so_rcv);
		so->so_rcv.sb_flags &= ~SB_UPCALL;
		SOCKBUF_UNLOCK(&so->so_rcv);
		so->so_upcall = NULL;
		so->so_upcallarg = NULL;
		soshutdown(so, SHUT_RDWR);
		closef(fp, NULL);
		NFSD_LOCK();
		if (slp->ns_nam)
			FREE(slp->ns_nam, M_SONAME);
		m_freem(slp->ns_raw);
		while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
			STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
			if (rec->nr_address)
				FREE(rec->nr_address, M_SONAME);
			m_freem(rec->nr_packet);
			free(rec, M_NFSRVDESC);
		}
		s = splsoftclock();
		for (nwp = LIST_FIRST(&slp->ns_tq); nwp; nwp = nnwp) {
			nnwp = LIST_NEXT(nwp, nd_tq);
			LIST_REMOVE(nwp, nd_tq);
			if (nwp->nd_cr != NULL)
				crfree(nwp->nd_cr);
			free((caddr_t)nwp, M_NFSRVDESC);
		}
		LIST_INIT(&slp->ns_tq);
		splx(s);
	}
}

/*
 * Derefence a server socket structure. If it has no more references and
 * is no longer valid, you can throw it away.
 */
void
nfsrv_slpderef(struct nfssvc_sock *slp)
{

	NFSD_LOCK_ASSERT();

	if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
		TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
		free((caddr_t)slp, M_NFSSVC);
	}
}

/*
 * Lock a socket against others.
 *
 * XXXRW: Wait argument is always 1 in the caller.  Replace with a real
 * sleep lock?
 */
int
nfs_slplock(struct nfssvc_sock *slp, int wait)
{
	int *statep = &slp->ns_solock;

	NFSD_LOCK_ASSERT();

	if (!wait && (*statep & NFSRV_SNDLOCK))
		return(0);	/* already locked, fail */
	while (*statep & NFSRV_SNDLOCK) {
		*statep |= NFSRV_WANTSND;
		(void) msleep(statep, &nfsd_mtx, PZERO - 1, "nfsslplck", 0);
	}
	*statep |= NFSRV_SNDLOCK;
	return (1);
}

/*
 * Unlock the stream socket for others.
 */
void
nfs_slpunlock(struct nfssvc_sock *slp)
{
	int *statep = &slp->ns_solock;

	NFSD_LOCK_ASSERT();

	if ((*statep & NFSRV_SNDLOCK) == 0)
		panic("nfs slpunlock");
	*statep &= ~NFSRV_SNDLOCK;
	if (*statep & NFSRV_WANTSND) {
		*statep &= ~NFSRV_WANTSND;
		wakeup(statep);
	}
}

/*
 * Initialize the data structures for the server.
 * Handshake with any new nfsds starting up to avoid any chance of
 * corruption.
 */
void
nfsrv_init(int terminating)
{
	struct nfssvc_sock *slp, *nslp;

	NET_ASSERT_GIANT();
	NFSD_LOCK_ASSERT();

	if (nfssvc_sockhead_flag & SLP_INIT)
		panic("nfsd init");
	nfssvc_sockhead_flag |= SLP_INIT;
	if (terminating) {
		TAILQ_FOREACH_SAFE(slp, &nfssvc_sockhead, ns_chain, nslp) {
			if (slp->ns_flag & SLP_VALID)
				nfsrv_zapsock(slp);
			TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
			free((caddr_t)slp, M_NFSSVC);
		}
		nfsrv_cleancache();	/* And clear out server cache */
	} else
		nfs_pub.np_valid = 0;

	TAILQ_INIT(&nfssvc_sockhead);
	nfssvc_sockhead_flag &= ~SLP_INIT;
	if (nfssvc_sockhead_flag & SLP_WANTINIT) {
		nfssvc_sockhead_flag &= ~SLP_WANTINIT;
		wakeup(&nfssvc_sockhead);
	}

	TAILQ_INIT(&nfsd_head);
	nfsd_head_flag &= ~NFSD_CHECKSLP;

#if 0
	nfs_udpsock = (struct nfssvc_sock *)
	    malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
	STAILQ_INIT(&nfs_udpsock->ns_rec);
	TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);

	nfs_cltpsock = (struct nfssvc_sock *)
	    malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
	STAILQ_INIT(&nfs_cltpsock->ns_rec);
	TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
#endif
}
OpenPOWER on IntegriCloud